Dictionary![]() ![]() cys•ta•thi•o•ninePronunciation: (sis"tu-thī'u-nēn", -nin), [key] —n. Biochem. an amino acid, C7H14O4N2S, that is an intermediate in the transfer of sulfur from methionine to cysteine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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